Type 8 primaries anyone? - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Performance, Mods & Tuning

C900 Performance, Mods & Tuning Covers Tuning & Performance modifications for the Classic 900 (C900)

SaabCentral.com is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 17th November 2010
mmoe's Avatar
mmoe mmoe is offline
Saab Lunatic
 
Join Date: Jun 2009                                                
Location: Seattle
My Saabs: 86 & 87 Flatnose T'verts, 86 SPG, 89T
Posts: 1,190
Default Type 8 primaries anyone?

I've got a quote for some custom type 8 primaries and hope to get a group buy situation put together. These would be completely made from scratch with the proper splines for the factory shafts, upper and lower, and would have the proper upper bearing cavity along with the circlip/retainer ring slots in the upper gear. The holes for drifting in the lower nut will also be present.

I was quoted $600/set for a series of 10 sets, possibly less if there are more. Also, the price could be less if the gearshop has the proper broach for the splines in stock already (he needs me to bring the shafts in to know for sure).

The teeth would be the same as factory, however they would be straight cut rather than helical cut from row to row. I'm still waiting to hear how much more a helical cut (as the factory sprockets are) would cost, but the shop is capable of doing it. At $600/set, we could also have 4 rows of teeth, though I'm not sure that it's necessary nor easy to fit in the case. That would also require modification to the tensioner, so we'll probably be sticking with 3 rows unless there's some outcry about it.

How many would be interested? What further information would you like to have? As it sits right now, 4-6 more sets spoken for would probably be enough to meet the 10 set minimum. If we can get it to 20, we may see the price go down. Given that a used set will usually get this much, even $600 seems pretty reasonable to me.

The gearshop is called Custom Gear, Inc. here in Seattle and was highly recommended to me by The Gear Works (also in Seattle). The work I've seen in the shop appears to be all very high quality. I do a little machine work myself, so I don't say that without a little knowledge about what I'm looking at.
Reply With Quote Quick reply to this message
  #2  
Old 18th November 2010
TooMany2cvs's Avatar
TooMany2cvs TooMany2cvs is offline
Saabista
 
Join Date: Jun 2007                                                
Location: NW of London
My Saabs: '90 900T16 3dr - For Sale!
Posts: 10,081
Default

Quote:
Originally Posted by mmoe View Post
I was quoted $600/set for a series of 10 sets, possibly less if there are more.
Rather than remake t8s - which are available, albeit not in huge quantity - would it be possible to make other gearings?

t9s, maybe? (Is there enough space in the primary housing?)
or t8.5s, with the lower sprocket smaller but the same upper and a shorter chain?
__________________
Adrian
Soon to be living life on the road in an old VW
http://WhereverTheRoadGoes.com
Reply With Quote Quick reply to this message
  #3  
Old 18th November 2010
sonett1 sonett1 is offline
Saab Lunatic
 
Join Date: Dec 2003                                                
Location: ?
My Saabs: ?
Posts: 1,103
Default

What kind of chains would be used with these sprockets?
__________________
"It's there to remind our lads who they're playing for, and to remind the opposition who they're playing against." Bill Shankly about the 'This is Anfield' plaque
Reply With Quote Quick reply to this message
  #4  
Old 18th November 2010
mmoe's Avatar
mmoe mmoe is offline
Saab Lunatic
 
Join Date: Jun 2009                                                
Location: Seattle
My Saabs: 86 & 87 Flatnose T'verts, 86 SPG, 89T
Posts: 1,190
Default

Quote:
Originally Posted by sonett1 View Post
What kind of chains would be used with these sprockets?
The factory original chains would be used, same tooth spacing and same number of links overall.
Reply With Quote Quick reply to this message
  #5  
Old 18th November 2010
sonett1 sonett1 is offline
Saab Lunatic
 
Join Date: Dec 2003                                                
Location: ?
My Saabs: ?
Posts: 1,103
Default

Quote:
Originally Posted by mmoe View Post
The factory original chains would be used, same tooth spacing and same number of links overall.
That could be OK, old chains on new sprockets? It would be good to have new chains.
__________________
"It's there to remind our lads who they're playing for, and to remind the opposition who they're playing against." Bill Shankly about the 'This is Anfield' plaque
Reply With Quote Quick reply to this message
  #6  
Old 18th November 2010
euromobile900's Avatar
euromobile900 euromobile900 is offline
Saab Lunatic
 
Join Date: Jun 2008                                                
Location: Burlington, VT, USA
My Saabs: 1986 900S 16V N/A
Posts: 1,234
Default

Quote:
Originally Posted by sonett1 View Post
That could be OK, old chains on new sprockets? It would be good to have new chains.
Those're available, at least in North America. For international buyers, mmoe, are you planning on sending chains with the gears? A bulk order from eeuro wouldn't be at all painful.
__________________
Quote:
Originally Posted by TooMany2cvs
There is a substitute for cubic inches - it's called subtlety and intelligence.
Reply With Quote Quick reply to this message
  #7  
Old 18th November 2010
mmoe's Avatar
mmoe mmoe is offline
Saab Lunatic
 
Join Date: Jun 2009                                                
Location: Seattle
My Saabs: 86 & 87 Flatnose T'verts, 86 SPG, 89T
Posts: 1,190
Default

Quote:
Originally Posted by TooMany2cvs View Post
Rather than remake t8s - which are available, albeit not in huge quantity - would it be possible to make other gearings?

t9s, maybe? (Is there enough space in the primary housing?)
or t8.5s, with the lower sprocket smaller but the same upper and a shorter chain?
I didn't answer this earlier because I had to check my suspicions regarding the fit. There are significant design issues with both the upper and lower sprockets that prevent the addition/subtraction of more teeth. The lower sprocket must fit over/around the front input shaft bearing and there is simply not enough meat left to support the teeth at that diameter. The upper sprocket could be made, though it appears that modification to the primary case would be required for clearance (though it would be close). For all practical purposes, type 8 is the limit.

Another option would be a custom ring/pinion which could provide a type 8 revolutions equivalent with type 6 primaries, which would further allow type 9 revs to be produced with type 7 primaries. However, that would require a rebuild to put into service and it may apply more stress than the somewhat undersized gears could handle.
Reply With Quote Quick reply to this message
  #8  
Old 18th November 2010
dmgb5's Avatar
dmgb5 dmgb5 is offline
dmgWarden
 
Join Date: May 2003                                                
Location: Portland, OR / Oxted, UK
My Saabs: '89 900 T16Spg, '97 9000 Aero
Posts: 2,530
Garage
Default

Hasn't this been covered before....http://www.saabcentral.com/forums/sh...type+primaries. That said I have type 8's and I might be interested in a second set at the right price.
Reply With Quote Quick reply to this message
  #9  
Old 18th November 2010
mmoe's Avatar
mmoe mmoe is offline
Saab Lunatic
 
Join Date: Jun 2009                                                
Location: Seattle
My Saabs: 86 & 87 Flatnose T'verts, 86 SPG, 89T
Posts: 1,190
Default

Quote:
Originally Posted by dmgb5 View Post
Hasn't this been covered before....http://www.saabcentral.com/forums/sh...type+primaries. That said I have type 8's and I might be interested in a second set at the right price.
The price is listed. The thread you linked to showed a bunch of people saying the same thing, that they'd like a set for the right price but no one ever says what their budget would be. I'd like a set for $100, but that's not reality. $600 is what they will cost (+/- depending on final design), so that information is there. Shipping will be extra of course but they should fit nicely into the flat rate boxes at the USPS, which given the weight will likely be the cheapest method. In the U.S, that would probably be around $20-25 priority and international shipping would be around $45.

In the other thread, no one even found a source that could build them. The gearshop I've found is not only capable, but willing to provide whatever we ask. If we decide we all would prefer the helical cut, it will be a bit more. If we decide we're OK with the straight cut, then this is the estimate given to me. If we wanted a 4th row of teeth, it would be approx. an extra $20/sprocket. The one thing I need to verify is whether or not the gears were spec'd at the 62C rockwell hardness that the originals are. He gave me a specified material, but I don't recall asking what it's native hardness is. I'll also look into what cryo-treating these would cost. IMHO, if the metal is at least 56C, they would probably be fine without treatment, but I will work on getting that spec from the shop.

It should be noted that these are absolutely 100% custom sprockets made from a blank. There would be no use of catalog parts or anything like that. The teeth will be cut to spec, the splines will be cut to spec, the bearing pocket will be cut to spec, the bearing retainer circlip slot will be cut to spec and the clutch shaft retaining ring slot will be cut to spec. All of these specs will match the factory specs for the type 7s, only with more/less teeth where appropriate. The area surrounding the front input shaft bearing will be beefed up as much as possible to provide support to the rear row of teeth, without interfering with the bearing/housing. The holes for the factory input shaft nut drifts will be provided. These will be as close to the factory originals as possible within what I believe to be a reasonable budget.
Reply With Quote Quick reply to this message
  #10  
Old 18th November 2010
euromobile900's Avatar
euromobile900 euromobile900 is offline
Saab Lunatic
 
Join Date: Jun 2008                                                
Location: Burlington, VT, USA
My Saabs: 1986 900S 16V N/A
Posts: 1,234
Default

I'd be in if I didn't already have a set! Unfortunately (fortunately?) I just got my grubby hands on some real SAAB ones.

If it means anything to anybody, I've found another part number for the top sprocket bearing, so you won't have to pay through the nose for that either. Same thing as is used in Jeep axles, and sold by SKF:

SAAB # 8710865
Timken #s U298 and U261L (cup and cone respectively) OR U298-90011 (unit part number)
SKF # 331579B
Asking a NAPA auto parts store in the USA for a BR9 (or searching on the Napa site for it) will also get you this bearing, probably an SKF 331579B, and at a rate much cheaper than what eEuroparts or the Saabsite charges. RockAuto also uses the SKF BR9 part number but I haven't actually seen one of those. It comes with a compression sleeve for use in a rear axle, but this is a separate part and means nothing to us (would make a good paperweight). They also go in rear axles of certain American cars (jeep ZJ with 44 or 35 rear axle to name one), as well as in some John Deere implement.

FWIW.
__________________
Quote:
Originally Posted by TooMany2cvs
There is a substitute for cubic inches - it's called subtlety and intelligence.

Last edited by euromobile900; 18th November 2010 at 11:29 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:40 AM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.